如何使用c＃对Ip地址列表进行排序
我有一个IP地址列表如下
192.168.1.5 69.52.220.44 10.152.16.23 192.168.3.10 192.168.1.4 192.168.2.1 我正在寻找这种方法来排序这个列表以匹配下面的顺序
10.152.16.23 69.52.220.44 192.168.1.4 192.168.1.5 192.168.2.1
这可能看起来像一个黑客，但它完全符合您的需求：
var unsortedIps = new[] { "192.168.1.4", "192.168.1.5", "192.168.2.1", "10.152.16.23", "69.52.220.44" }; var sortedIps = unsortedIps .Select(Version.Parse) .OrderBy(arg => arg) .Select(arg => arg.ToString()) .ToList();
您可以将每个IP地址转换为如此整数…
69.52.220.44 => 69 * 255 * 255 * 255 + 52 * 255 * 255 + 220 * 255 + 44
然后按整数表示排序。
您可能会发现此function也很有用。
public static class ExtensionMethods { public static int CompareTo(this IPAddress x, IPAddress y) { var result = x.AddressFamily.CompareTo(y.AddressFamily); if (result != 0) return result; var xBytes = x.GetAddressBytes(); var yBytes = y.GetAddressBytes(); var octets = Math.Min(xBytes.Length, yBytes.Length); for (var i = 0; i < octets; i++) { var octetResult = xBytes[i].CompareTo(yBytes[i]); if (octetResult != 0) return octetResult; } return 0; } }
您可以将Array.Sort函数与我们将创建的用于比较两个IP的函数一起使用：
//ips is string array Array.Sort(ips, IpCompare);
然后将此函数放入代码中。
private static int IpCompare(string x, string y) { string ip1 = x + '.', ip2 = y + '.'; string xSection = "", ySection = ""; for (int i = 0; i < ip1.Length && i < ip2.Length; i++) { if (ip1[i] == '.' && ip2[i] == '.') { if (xSection != ySection) return int.Parse(xSection) - int.Parse(ySection); xSection = ""; // Start compare the next section ySection = ""; } else if (ip1[i] == '.') return -1; //The first section is smaller because it's length is smaller else if (ip2[i] == '.') return 1; else { xSection += ip1[i]; ySection += ip2[i]; } } return 0; //If we would find any difference between any section it would already return something. //so that mean that both IPs are the same }